On the left we have the scarce but known Fred Locke U-242 (all fred locke specimens are MLOD, glazed pinhole) but on the right we have a...??? unreported signal ! likely this insulator would have the following characteristics: 1- Mold line over dome. 2- Sandy tan to brown glaze, 3-fully glazed pinhole with well formed threads with dime shaped impression at the top . 4- Rough filed firing rest . 5- Could be white or brown glaze ... This is one insulator that could be out there in a collection and have been overlooked in the past or misidentifyed as a pittsburg or something . .....keep your eyes out and please report it id you have or know of one ...